Items 1-12 consist of manuscript notes and drafts, many heavily revised, for books projected but not completed by Hartree as single author or in collaboration. Lady Jeffreys (née Bertha Swirles, Hartree's collaborator on his proposed book on Mechanics (Items 1-10)) retains some duplicated lecture-notes of his courses, and some calculations made by his father, William Hartree, on an early, hand-operated Brunsviga.
Items 15 and 16 were received from Professor Wilkes, whose explanatory notes accompany both files. Item 15 consists of Hartree's notes for a course of lectures on Partial Differential Equations to be given in the University of Cambridge; Item 16 is notes taken by him of lectures given by A.M. Turing 1946-47. Fuller information on both these files is given in the handlist below.
Item 17 consists of Xerox copies of letters, or notes of letters, written by Hartree to E.V. Appleton; they were received from Mrs. Hartree via Professor C. Stewart Gillmor.
Some of Hartree's early calculating machines are held in the Science Museum, South Kensington, London.
All the items in the handlist are manuscript unless otherwise stated. Titles and descriptions in inverted commas are those which appear on the documents.